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Ping pong balls are white or orange, and they are sold according to a three-star rating. Three-star balls are of the highest quality and are used in competition. The mandatory diameter of a ping pong ball for competitive play is 40 millimeters, which The International Table Tennis Federation mandated in 2000. The ITTF believes that a larger ball slows down the pace of the game, making it easier for television viewers to follow the game.